Support to accumulate PWM of different controllers for same sensor

Description:
1. Add one property: accumulateSetPoint in zone of fan table that could
be used to enable accumulation of output PW

Support to accumulate PWM of different controllers for same sensor

Description:
1. Add one property: accumulateSetPoint in zone of fan table that could
be used to enable accumulation of output PWM of different controllers
with same sensor.

2. Add one property: checkHysterWithSetpt in pid info of fan table to
select to compare current input and setpoint to check hysteresis.

3. The purpose of accumulate the stepwise output and PID output for
one sensor is that the setting of stepwise could use to prevent
the fan speed from suddenly increasing from a very low speed to a
very high speed due to reaching the setpoint.

Use stepwise before setpoint could also keep the PWM steady at
low ambient temperature.

Design:
1. Search "accumulateSetPoint" field in fan table.
If the value was true, accumulate the output PWM of different
controllers with same profile name.

2. Support two method to calculate PID output that could be chosen by
setting the "checkHysterWithSetpt" to true in pid info of fan table.

If the flag was set to true, it won't calculate PWM output if the
input lower than setpoint.

Test Case:
1. Check the output PWM of different controllers with same profile
name could be accumulated - pass.

2. Set "checkHysterWithSetpt" to true and check PID output would not be
calculated if the input temperature was lower than setpoint - pass.

Please see more details in gist:
https://gist.github.com/DelphineCCChiu/a6170d3e1a12fc4ee76fad324382fba3

Change-Id: I9f38f250d72545784c6c11be2fde7d45f0b385c4
Signed-off-by: Delphine CC Chiu <Delphine_CC_Chiu@wiwynn.com>

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Implementing the TempToMargin feature

Wrapping the input name std::string in a new structure SensorInput, so
that the TempToMargin information can be cleanly carried along with
it, all the way down

Implementing the TempToMargin feature

Wrapping the input name std::string in a new structure SensorInput, so
that the TempToMargin information can be cleanly carried along with
it, all the way down to the PID input processing layer where it is
needed. This allows the conversion to be done just-in-time before the
temperature reading is interpreted, minimizing the blast radius of
this change. Nonetheless, because of the type change, there was a
somewhat large blast radius to implement this feature.

The design, and the documentation, is already here:
https://github.com/openbmc/phosphor-pid-control/issues/23

Tested: Added unit tests for JSON parsing and for proper execution
of the TempToMargin feature. They pass. Ran it locally, on our
appropriately-configured system, and it seems to work for me.

Change-Id: I598ba485195aaa70c26e91a1da3ab88fff8c3a4c
Signed-off-by: Josh Lehan <krellan@google.com>

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clang-format: copy latest and re-format

clang-format-16 has some backwards incompatible changes that require
additional settings for best compatibility and re-running the formatter.
Copy the latest

clang-format: copy latest and re-format

clang-format-16 has some backwards incompatible changes that require
additional settings for best compatibility and re-running the formatter.
Copy the latest .clang-format from the docs repository and reformat the
repository.

Change-Id: Icbc50d46e84ee7ef756705e2b19741439a325074
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>

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Adding new feature of core PID loop logging

This differs from the normal logging,
as this focuses on the core of the PID loop computations.

All variables within the core pid/ec/pid.cpp pid()
functi

Adding new feature of core PID loop logging

This differs from the normal logging,
as this focuses on the core of the PID loop computations.

All variables within the core pid/ec/pid.cpp pid()
function are now logged, so math can be debugged.

Output is throttled to only log a new line
when it changes, or when 60 seconds have elapsed.

Creates 2 files for each PID loop,
one showing coefficients that were configured for it,
and one showing the variables changing over time.

Enable by --corelogging command line option,
or by creating /etc/thermal.d/corelogging file.

Tested:
Log files appear as expected, when enabled.
No changes noticed, when this feature is disabled.

Signed-off-by: Josh Lehan <krellan@google.com>
Change-Id: I3f37fe918e7cbc6fb885ffa2f268600d5a317d32

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Support derivative term in PID algorithm and support to set cycle interval time from fan table

1. Support to calculate derivative term in PID algorithm.
2. Add two properties: cycleIntervalTimeMS an

Support derivative term in PID algorithm and support to set cycle interval time from fan table

1. Support to calculate derivative term in PID algorithm.
2. Add two properties: cycleIntervalTimeMS and updateThermalsTimeMS
in fan table that could be used to decide "time interval of PID control loop"
and "time interval to update thermals' cached value".

Tested:

- PID algorithm:
1. Check pid-control-service could calculate output PWM
according to the fan table.

[Test log]
root@greatlakes:~# systemctl status phosphor-pid-control -l
* phosphor-pid-control.service - Phosphor-Pid-Control Margin-based Fan Control Daemon
Loaded: loaded (/lib/systemd/system/phosphor-pid-control.service; enabled; preset: enabled)
Active: active (running) since Fri 2018-03-09 05:09:35 PST; 1min 47s ago
Main PID: 3105 (swampd)
CGroup: /system.slice/phosphor-pid-control.service
`-3105 /usr/bin/swampd -c /usr/share/entity-manager/configurations/fan-table.json
...
Mar 09 05:10:29 greatlakes phosphor-pid-control[3105]: PID Zone 1 max SetPoint 3.75 requested by
PID_NIC_SENSOR_TEMP BMC_SENSOR_FAN0_TACH BMC_SENSOR_FAN2_TACH BMC_SENSOR_FAN4_TACH BMC_SENSOR_FAN6_TACH

- Cycle interval time:
1. Set cycleIntervalTimeMS and updateThermalsTimeMS
to 1000 ms in fan table
2. Check service would update thermal every second from debug log.

[Test log]
root@greatlakes:~# journalctl -u phosphor-pid-control --since "Mar 09 04:52:16"
Mar 09 04:52:16 greatlakes systemd[1]: Started Phosphor-Pid-Control Margin-based Fan Control Daemon.
...
Mar 09 04:53:28 greatlakes phosphor-pid-control[2795]: processThermals
Mar 09 04:53:28 greatlakes phosphor-pid-control[2795]: processFans
Mar 09 04:53:29 greatlakes phosphor-pid-control[2795]: processThermals
Mar 09 04:53:29 greatlakes phosphor-pid-control[2795]: processFans
Mar 09 04:53:30 greatlakes phosphor-pid-control[2795]: processThermals
Mar 09 04:53:30 greatlakes phosphor-pid-control[2795]: processFans

Change-Id: I04e1b440603c3ad66a1e26c96451992785da6fe6
Signed-off-by: Bonnie Lo <Bonnie_Lo@wiwynn.com>

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sensors/zones: place in namespace and cleanup

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: I527dbc8477a232945f696227a7b0b2adbee45175

conf change: pid: all pid details are now camelCase

Convert all PID configuration details are now camelCase instead of snake
case.

Change-Id: Id132053f122dfcd8abaace17df91c99758

conf change: pid: all pid details are now camelCase

Convert all PID configuration details are now camelCase instead of snake
case.

Change-Id: Id132053f122dfcd8abaace17df91c99758eb2b0c
Signed-off-by: Patrick Venture <venture@google.com>

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pid: rename structure components for style

Rename the struct components to camelCase.

Change-Id: I0e76c4bd5aed0ec2d78edd31ddef66f852ddc71e
Signed-off-by: Patrick Venture <ventur

pid: rename structure components for style

Rename the struct components to camelCase.

Change-Id: I0e76c4bd5aed0ec2d78edd31ddef66f852ddc71e
Signed-off-by: Patrick Venture <venture@google.com>

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Add Hysteresis to pid controllers

Add hysteresis to pid controllers to lower pwm changes.
It is defaulted to 0 so it should be transparent
to any controller that choses not to implem

Add Hysteresis to pid controllers

Add hysteresis to pid controllers to lower pwm changes.
It is defaulted to 0 so it should be transparent
to any controller that choses not to implement it.
This is the same pattern used by the stepwise controller.

Tested-by: Unit tests passed

Change-Id: Ib47114285b0017258b7f77eaf067d310f95a0c60
Signed-off-by: James Feist <james.feist@linux.intel.com>

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Move all floats to doubles

The code was developed initially around a pid loop implemented using
floats. Therefore, the code was converting back and forth between
double for sensor v

Move all floats to doubles

The code was developed initially around a pid loop implemented using
floats. Therefore, the code was converting back and forth between
double for sensor values as inputs and outputs from this PID loop.

Change-Id: I2d2919e1165103040729c9f16bb84fde3dd6b81b
Signed-off-by: Patrick Venture <venture@google.com>

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add .clang-format

Change-Id: I6627b5569c2e0f730be7331403218b823a2c622f
Signed-off-by: Patrick Venture <venture@google.com>

PID Objects & Algo

These are the PID controller implementations for fans,
and thermals. This also includes the PID algorithm used.

Change-Id: I30471fbf7a8a7ed65f78bf105970d6281

PID Objects & Algo

These are the PID controller implementations for fans,
and thermals. This also includes the PID algorithm used.

Change-Id: I30471fbf7a8a7ed65f78bf105970d62815fedc56
Signed-off-by: Patrick Venture <venture@google.com>

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